Ash support for mechanical stokers



Dec. 1, 1925- 1,563,930

\ R. s. RILEY ASH SUPPORT FORMECHANICAL STOKERS Filed Jan. 29. 1924 2Sheets-Sheet 1 I N VEN TOR. E0552?" 5. fE/LE) Dec. 1 1925- 1,563,930 R.s. Rll EY I ASH SUPPORT FOR MECHANIAL STQKERS Filed Jan. 29. 1924 2Sheets-Sheet 2 JNi ENTOR.

HOBART 6. R/Lz Y Patented Dee. l,

UNITED STATES PATENT OFFICE.

ROBERT S. RILEY, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T $ANFORD RILEYSTOKER COMPANY, OF WORCESTER, MASSAGHUtBETTS, A CORPORATION OF MASSA-GHUSETTS.

ASH SUPPORT FOR MECHANTCAL s'lOKERs.

Application filed January 29, 1924. Serial No. 689,359.

fl '0 all whomit may concern Be it known that 1', Rosnu'r S. RiLnr, acitizen of the United States, residing at d orcester, in the county ofVforcester and State of Massachusetts, have invented a new and usefulAsh Support for Mechanical Stoker's, of which the following is aspecification.

This invention relates to a mechanical Stoker andpartieularly toimproved devices for supporting and agitating the ash and refuse at therear of the stoker and for preventing the formation of clinkers upon therear or bridge wall of the stoker. The

' invention is shown as applied. to a comlnercial underfeed Stoker ofthe type shown in applicants prior Patent- No. 1,822,822, issuedNovember 25, 1919.

The general object of my invention is to provide an ash supporting gratebeyond the refuse dumping devices in a mechanical Stoker, together withsuitable i'uechanism for giving such a grate repeated raising andlowering movements.

My invention also comprises novel sup- POI't iHg and air supplying meansfor such a grate. By thus supporting and agitating the ash and refuseadjacent the bridge wall and by supplying air under pressure thereto,ii. are able to more completely consume the combustible material in therefuse and to largely prevent the formation of clinkers on the bridgewall.

Further features of my invention relate to combinations of parts whichwill be hereinafter described and more particularly pointed out in theappended claims.

A. preferred form of the invention is shown in the drawings, in whichFig. 1 is a sectional side elevation of my improved ash support,together with certain associated parts of an underfeed Stoker;

Fig. 2 is a fragmentary front elevation of the ash support and itsoperating means;

Fig. 3 is a fragmentary sectional elevation taken along the line 3-3 inFig. 1;

Fig. 1 is a side elevation of one form of operating mechanism for movingmy improved ash support; and

Fig. 5 is a detail plan view of a portion of the operating mechanism.

Referring to the drawings, l. haveindicated a dumping plate mounted atthe rear of a stohern'et r a portion o the le l side wall beingindicated at 11. The plate lhese parts may be constructed and operatedexactly as shown in my priorPate-nt No. 1,322,822, to which reference ismade for a more complete description.

The usual bridge wall is indicated at and is shown as supported upon a.pair of I-beams 16 spaced apart to form an air chamber 1'4". A series ofheavy castings 18 are secured to the Lbeams andsupport the front portionof the bridge wall 15, as clearly shown in Fig. 1. The lower portions ofthe castings 18 are provided with segmental guideways 19 (Fig. 3) andwith suitable air openings 20 between each pair of guideways.

Ash supporting grates 21 are provided with depending arcuate supports22, the upper concave edges of which fit between the guideways 19, thelower convex portions of which are provided with rack teeth 23. Thesupports 22 are of hollow construction and not only uphold thegrates 21but'also provide connecting air passages 22 between the outlets 20 ofthe air chamber 17 and the grates 21. An opening 22 in the concave upperface of each support 22 registers with an opening 20 in the air chamber17 when the parts are in normal operative position but is closed offwhen the grates 21 are lowered to dumping position.

Operating pinions 2 1 are mounted on a shaft and engage the rack teeth23 upon the different grate supports 22. The tooth spaces of the pinions24: are indicated as cut away or bevelled (see Fig. 2) to prevent theaccumulation of dirt or ashes therein.

which air will be conveyed. to the refuse .supported thereon, while thedirect entrance crank 32 is connected by a link 34 to ahead 35 having abearing 36 for a crank pin 37. Thecrank pin 37 1s regularly rotated andmaybe mounted on the endof the crank shaft which drives the coal feedingrams, shown in my prior PatentNo. 1,322,822.

As the crank pin is rotated, motion is transmitted through the link 34:,the bellcrank 32 and link 31 to oscillate'the arm 30 about the shaft 251A hand wheel 40 is loosely mounted on the end of the shaft 25' and theadjacent faces of the hand wheel 40 and thearm 30 are provided withclutch teeth adapted for engagement by asliding clutch collar 41 keyedon the shaft 25. lVhen the collar ismoved to the right into operativeposition in Fig. 5 the refuse supportinggrates 21' will be regularlyoscillated or given limited up and down movementb the-automaticmechanism shown in hen the clutch collar is moved to the left, therefuse supporting grates 21 may be moved to any'desired positionmanually.

It will be understood that the automatic movement of'the grates isoflimited extent, so that the'refuse supported thereby is agitatedbut isnot'permittedto' escape past the grates 21 or the plates 10 tothe ashpit. lVhenthe refuse is 'to'be dumped, the grates 21 may be swungdownward manually to the extreme position indicated in dottedl111QS'iIfF1gL1, onthe refuse'may be dumped by moving the rack bars 13'forward'and allowing the dumpingp'lates10 to swing downward; If desired,a combination of these two movements may be used.

The provision ofanair admittingrefuse supporting grate not only assistsin consuming the last remnants. of" combustible material? in the refusebut" also, by" contin ually agitating the; refuse adiacent' the bIlClQ'Gwall, these gratesipractically' prevent theformation of clinkers uponthe bridge wall, a most desirable: result. 2

Having thus described 'my' invention. and theadvantages thereof; I donot wish to be limited to the details herein disclosed" otherwise than:as set" forth" in the claims,but

what I claim is 1. Ina stoker, a movably mounted refusesupporting grate,means to give said grate repeated limited raising and lowering movementsto agitate the refuse while said grate remains in operativeash-supporting position, means to give said grate anadditional loweringmovement away from ash-supporting posltionato'discharge refusetherefrom, and means to supply air under pressure to said grate during'its-limited movements and so long as it remains in ash-supportingposition and to cut off the air supply during 1ts additional loweringmovement and so long as said grate is in lowered position.

2. Ina stoker, a movably mounted refuse supporting grate, automaticmeans to give said grate repeated limited raising and low-' eringmovements to agitate the refuse while said grate remains in operativeash-supporting position, manual means to give said grate an additionallowering movement away from ash-supporting position to discharge refusetherefrom, and means to supply air under pressure to said grate duringits limited movements and so longas it remains in ash-supportingposition and to cut off the air supply during its additional loweringmovement and'so long as said grate is in lowered position.

3; Ina stoker, a refuse dumping=- device, a refuse supporting gratepositioned beyond said dumping device and mounted. for oscillatingmovement, automatic means to 0s cillate said grate while inash-supporting position, means to dump said grate, and means to supplyairunder pressure to said grate in every operative ash-supportingposition thereof, and during said oscillating movements, the supply ofair being interrupted when the grate-is lowered to dumping position.

4. In a stoker, a bridge wall, a casting fixed in said bridge Wall andhaving arcuate guide-Ways formed therein, a. refuse-supporting'gratehaving a depending arcuate supporting portion fitting said'guide-ways,said supporting portion being movable therein to carry said'grate to andfrom ashsupporting position, and means to supply air under pressure tosaid grate in every operative aslrsupporting position thereof,

said grate being movable downward and' rearward" beneath said bridgewall for dumpingthe refuse.

In testimony whereof I affixed my signature;

ROBERT S. RILEY.

have hereunto

